A large number of these installations are in the SoMa neighborhood, with one being particularly suited to San Francisco: the Murmur Wall. Designed by Future Cities Lab and installed outside the Yerba Buena Center for the Arts, the 60-foot Murmur Wall is a mass of steel and acrylic tubing, LED lights and digital displays. The bent steel tubes bring to mind the bicycle racks dotted throughout the city, but the installation’s technology brings a decidedly more modern and social aspect to the art. Intermingling with the steel are a number of LED light tubes that lead into a series of screens at the piece’s center — and using your smartphone, you can send a short text message to the wall that’ll display on the tubes.